Senior Full-Stack .NET Developer

EPAM Systems Inc; United States; Remote; USD 110,000 - 150,000; Full time

Job summary

EPAM Systems Inc. in the United States is seeking a Senior Full-Stack .NET Developer to strengthen and modernize enterprise applications by remediating security vulnerabilities and supporting legacy systems while building modern .NET services.

You will work across backend, data, and frontend layers, collaborating with DevOps to deliver secure releases and ensure daily availability through 5:00 PM CT. This role requires hands-on experience with OWASP Top 10, SQL Server, and OpenID Connect.

Qualifications

• 3+ years of full-stack .NET development experience.
• Strong .NET security remediation experience with OWASP Top 10.
• Advanced troubleshooting for large legacy codebases.
• Proven ownership across maintenance and modernization efforts.
• Solid C# skills with .NET Framework and modern .NET (6/8+).
• Hands-on ASP.NET MVC, WCF, and ADO.NET experience.
• Strong SQL Server skills with secure data access practices.
• Practical JavaScript skills for frontend integration.
• Upper-Intermediate English (B2).
• Nice to have OAuth2 knowledge and OpenID Connect.
• Octopus Deploy familiarity.
• HTML and CSS skills.

Responsibilities

• Investigate and remediate security vulnerabilities, including OWASP Top 10 findings.
• Harden applications against SQL injection, XSS, and dependency risks.
• Maintain and modernize legacy .NET applications using ASP.NET MVC and WCF.
• Build and enhance ASP.NET Core Web APIs and modern .NET services.
• Implement secure data access with Microsoft SQL Server and ADO.NET.
• Develop frontend features using JavaScript and related web technologies.
• Collaborate with DevOps to support secure CI/CD and production deployments.
• Coordinate work to ensure daily availability until 5:00 PM CT

Skills

Full-stack .NET

OWASP Top 10

C#

ASP.NET MVC

WCF

ADO.NET

ASP.NET Core

JavaScript

SQL Server

OpenID Connect

OAuth2

HTML

CSS

English B2

Tools

Octopus Deploy

SQL Server Management Studio

Job description

We are seeking a Senior Full-Stack .NET Developer to strengthen and modernize enterprise applications by remediating security vulnerabilities and supporting legacy systems while building modern .NET services. You will work across backend, data, and frontend layers and partner with DevOps to deliver secure releases.

Responsibilities

• Investigate and remediate security vulnerabilities, including OWASP Top 10 findings
• Harden applications against SQL injection, XSS, and dependency risks
• Maintain and modernize legacy .NET applications using ASP.NET MVC and WCF
• Build and enhance ASP.NET Core Web APIs and modern .NET services
• Implement secure data access with Microsoft SQL Server and ADO.NET
• Develop and refine frontend features using JavaScript and related web technologies
• Collaborate with DevOps to support secure CI/CD and production deployments
• Coordinate work to ensure daily availability until 5:00 PM CT

Requirements

• 3+ years full-stack .NET development experience
• Strong .NET security remediation experience with OWASP Top 10
• Advanced troubleshooting skills for large legacy codebases
• Proven project ownership across maintenance and modernization efforts
• Solid C# skills with .NET Framework and modern .NET (6/8+)
• Hands-on ASP.NET MVC, WCF, and ADO.NET experience
• Strong SQL Server skills with secure data access practices
• Practical JavaScript skills for frontend integration
• Upper-Intermediate English proficiency (B2)
• Nice to have OAuth2 knowledge
• OpenID Connect knowledge
• Octopus Deploy experience
• HTML skills
• CSS skills